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eth/downloader: fix light client cht binary search issue

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Péter Szilágyi 2018-11-28 13:31:42 +02:00
parent bfed28a421
commit 174083c3ae
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1 changed files with 22 additions and 0 deletions
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22
eth/downloader/downloader.go
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@ -99,6 +99,7 @@ type Downloader struct {
mode SyncMode // Synchronisation mode defining the strategy used (per sync cycle)
mux *event.TypeMux // Event multiplexer to announce sync operation events
genesis uint64 // Genesis block number to limit sync to (e.g. light client CHT)
queue *queue // Scheduler for selecting the hashes to download
peers *peerSet // Set of active peers from which download can proceed
stateDB ethdb.Database
@ -664,7 +665,28 @@ func (d *Downloader) findAncestor(p *peerConnection, remoteHeader *types.Header)
}
p.log.Debug("Looking for common ancestor", "local", localHeight, "remote", remoteHeight)
if localHeight >= MaxForkAncestry {
// We're above the max reorg threshold, find the earliest fork point
floor = int64(localHeight - MaxForkAncestry)
// If we're doing a light sync, ensure the floor doesn't go below the CHT, as
// all headers before that point will be missing.
if d.mode == LightSync {
// If we dont know the current CHT position, find it
if d.genesis == 0 {
header := d.lightchain.CurrentHeader()
for header != nil {
d.genesis = header.Number.Uint64()
if floor >= int64(d.genesis)-1 {
break
}
header = d.lightchain.GetHeaderByHash(header.ParentHash)
}
}
// We already know the "genesis" block number, cap floor to that
if floor < int64(d.genesis)-1 {
floor = int64(d.genesis) - 1
}
}
}
from, count, skip, max := calculateRequestSpan(remoteHeight, localHeight)